Fallon opened The Tonight Show on Tuesday (August 12) by reflecting on Williams's life and influence, in addition to playing a clip of the comic's first interview with Johnny Carson on the NBC chatshow.

"He was one of a kind, he was unbelievable," Fallon said of Williams. "If you don't know his standup, you should watch it right now."

He continued: "You'd watch him and you would cry laughing, and you would think, 'I'm never going to see anyone like this human ever'."

Fallon also dubbed Williams to be the "Muhammad Ali of comedy", before reenacting an iconic scene from Dead Poets Society.

The Tonight Show was also followed by a second Williams tribute on Late Night with Seth Meyers.

"The saddest part of this was Robin was battling depression," Meyers told his viewers in an off-the-cuff address. "If there's anything we can do to honor his memory, I would hope it would be to use this opportunity to educate us more about this terrible affliction."

He went on to say: "We miss Robin, but we're also very lucky to have had him at all."